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Subbase
Sabtu, 2026-07-11 04:34:23In topology in mathematics, a subbase (or subbasis, prebase, prebasis) for the topology τ of a topological space (X, τ) is a subcollection B {\displaystyle...
Click to read more »Supercompact space
Sabtu, 2025-11-22 19:12:03there is a subbasis such that every open cover of the topological space from elements of the subbasis has a subcover with at most two subbasis elements...
Click to read more »Neighbourhood system
Rabu, 2026-06-17 16:07:38is the superset relation and not the subset relation). A neighbourhood subbasis at x {\displaystyle x} is a family S {\displaystyle {\mathcal {S}}} of...
Click to read more »Ordered field
Selasa, 2026-01-20 06:23:18{ P ∈ X F : a ∈ P } {\displaystyle H(a)=\{P\in X_{F}:a\in P\}} form a subbasis for the Harrison topology. The product is a Boolean space (compact, Hausdorff...
Click to read more »Locally convex topological vector space
Selasa, 2026-06-16 14:16:43{P}}} and r {\displaystyle r} ranges over the positive real numbers is a subbasis at the origin for the topology induced by P {\displaystyle {\mathcal {P}}}...
Click to read more »List of topologies
Senin, 2026-06-22 07:22:15extension topology on X {\displaystyle X} is the topology having as a subbasis the union of τ and the family of all subsets of X {\displaystyle X} whose...
Click to read more »Lawson topology
Selasa, 2024-12-31 04:32:35of domain theory. The lower topology on a poset P is generated by the subbasis consisting of all complements of principal filters on P. The Lawson topology...
Click to read more »Priestley space
Kamis, 2026-02-19 16:13:57clopen down-sets of X. (d) Clopen up-sets and clopen down-sets of X form a subbasis for (X,τ). (e) For each pair of closed subsets F and G of X, if ↑F ∩ ↓G...
Click to read more »Finite intersection property
Rabu, 2026-07-08 03:58:13proper filter has the finite intersection property. Every neighbourhood subbasis at a point in a topological space has the FIP, and the same is true of...
Click to read more »Topological vector space
Sabtu, 2026-05-30 15:34:59define a vector topology it suffices to define a neighborhood basis (or subbasis) for it at the origin. Theorem (Neighborhood filter of the origin)—Suppose...
Click to read more »Ziegler spectrum
Senin, 2022-09-19 11:38:07\operatorname {pinj} _{R}\mid \varphi (N)\supsetneq \psi (N)\cap \varphi (N)\}} as subbasis of open sets, where φ , ψ {\displaystyle \varphi ,\psi } range over (right)...
Click to read more »List of general topology topics
Senin, 2026-01-05 03:44:02Homeomorphism Local homeomorphism Open and closed maps Embedding Germ Basis Subbasis Open cover Locally finite space Covering space Atlas Limit point Net Filter...
Click to read more »Alexander's subbase lemma
Jumat, 2026-04-24 11:17:29X , {\displaystyle U\neq X,} and S {\displaystyle {\mathcal {S}}} is a subbasis generating X {\displaystyle X} 's topology (together with X {\displaystyle...
Click to read more »Polar topology
Minggu, 2026-03-01 17:07:50\left\{rG^{\circ }~:~G\in {\mathcal {G}},r>0\right\}} forms a neighbourhood subbasis at the origin. When Y {\displaystyle Y} is endowed with this G {\displaystyle...
Click to read more »Glossary of general topology
Jumat, 2026-06-05 12:53:02term weaker topology. Subbase A collection of open sets is a subbase (or subbasis) for a topology if every non-empty proper open set in the topology is the...
Click to read more »Dual system
Kamis, 2026-04-16 11:22:38{\displaystyle \left\{rG^{\circ }:G\in {\mathcal {G}},r>0\right\}} forms a subbasis of neighborhoods at the origin. When Y {\displaystyle Y} is endowed with...
Click to read more »Dhakaiyas
Sabtu, 2026-04-11 13:52:34khoshbas meaning happily-settled. Other names for them included sukhbas and subbasi. Originally an Urdu-speaking community, their time in Bengal led to the...
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